I have a classic japspeed down pipe with a 100cel sports cat and turbo bellmouth on my classic. (£250 new)
The only issue people seem to have on the japspeed downpipes is the bracket half way down that fixes to the side of the gearbox. the hole for the bolt isn't quite lined up usually so you need to be prepared to widen it to get it to fit right.
Not sure if newage has the same bracket.
Otherthan that, they seem decent enough
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